JPS602344Y2 - Disc for improved flexible coupling - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a flexible coupling disk that flexibly connects a drive shaft and a driven shaft and smoothly transmits rotational force.

Figures 1 and 2 show a conventional flexible coupling disk, in which 1 is a rubber disk with a hollowed out center, and symmetrically with respect to the center are a plurality of cylindrical bushings 2 with flanges at both ends.
is planted.

3 is a restraining member formed in a loop shape, and is made of rayon,
It is a bundle of fiber cords made of polyester or the like having a rectangular cross-section, and is inserted between the seven land portions 10 of the cylindrical bushings 2 so as to restrain each pair of adjacent cylindrical bushings 2. A constant tension is applied to the upper and lower parts alternately.

Therefore, when connecting the driving shaft and the driven shaft,
To the cylindrical bushing 2 of the rubber disk 1, a flanch with protruding hook-shaped arms is attached to each shaft at a corresponding position on every other shaft, and the positions of the arms on the driving shaft side and the driven shaft side are set on the cylindrical bushing 2. The bolts are inserted into the arm of the flange and the cylindrical bushing 2, and the bolts are inserted into the cylindrical bushing 2
The drive shaft and driven shaft are connected by tightening nuts at 10 locations on the flange.

The cylindrical bushing 2 is conventionally made of carbon steel by forging, and its surface is a forged skin and has a rough surface.

FIG. 3 is a diagram showing the state of the restraint member 3 after the coupling disk having the above structure is actually operated and a load is applied.

That is, in the restraining member 3 that is stretched between a pair of adjacent cylindrical bushings 2, the fiber cords constituting the restraining member 3 are arranged tightly on the side near the outer surface of the cylindrical bushings 2.
The outer surface of the surface becomes rougher as it goes outward.

The reason is that when manufacturing the coupling disc,
In the restraining member 3, each fiber cord is stretched between a pair of adjacent cylindrical bushes 2 with equal tension, that is, with the same density as a whole, and is installed in the molding die in this state. The unvulcanized rubber material forming the rubber disc 1 is poured into a mold, heated and vulcanized, thereby producing the rubber disc 1.

At this time, each fiber cord forming the restraint member 3 is given a certain shrinkage margin by heating and subsequent cooling.

Therefore, once this coupling disk is operated and a load is applied, each fiber cord constituting the restraining member 3 to which the above-mentioned fixed shrinkage margin has been given will stretch, and during this stretching, the elongation will be reduced. Of the fiber cords constituting the restraint member 3, the outer fiber cords have a larger absolute amount than the fiber cords wrapped around the side closer to the outer surface of the cylindrical bushing 2, and as a result, as mentioned above, In the restraining member 3 that is hung between the restraining members 3 and 3, the fiber cords constituting the fiber cords are densely arranged on the side closer to the outer surface of the cylindrical bushing 2 and become coarser as they go outward from the outer surface of the cylindrical bushing 2. It becomes.

This means that when the coupling is in operation and a load is applied, the force is transmitted only by the fiber cord near the outer surface a of the cylindrical bushing 2, of the restraining member 3 that transmits torque. This cord part accelerates fatigue and
Also, during operation, the restraining member 3 directly rubs against the surface a of the cylindrical bushing 2, and at this time, since the surface a of the cylindrical bushing 2 is a rough surface that is a forged skin, a strong frictional force is generated and the restraining member is worn out. 3 leads to premature breakage.

The present invention was developed in view of the above circumstances, and its gist is that a plurality of cylindrical bushings with flanges at both ends are planted symmetrically around the center of a rubber disk with a hollowed out center. Between the cylindrical bushes, a restraining member made by bundling fiber cords of rayon, polyester, etc. into a loop having a rectangular cross section is attached to the cylindrical bushings so as to restrain each pair of adjacent cylindrical bushes. The hanging position is alternately shifted, a certain tension is applied, the rope is hung, and the material is buried in a rubber disk.

In the flexible coupling disc which is made up of a plurality of cylindrical bushes, the outer surface of the cylindrical bushings with which the restraining members of the cylindrical bushings with flanges at both ends come into contact has a mirror finish.

Next, this will be explained with reference to the drawings.

FIG. 4 shows a cylindrical bushing B with flanges at both ends according to the present invention, and the outer surface of the cylindrical part of the cylindrical bushing B has a mirror finish.

This mirror finish is achieved by mechanical polishing means to 6 or less.

Therefore, the cylindrical bushing B with flanges at both ends having the above-mentioned configuration is implanted in the rubber disk 1 which is hollowed out in the center of the flexible coupling disk shown in FIGS. 1 and 2 described as a conventional example. At the same time, a loop-shaped restraining member 3 is embedded between each cylindrical pusher 3B with a constant tension applied thereto.

The improved flexible coupling disk of the present invention having the above-mentioned structure has a mirror finish on the outer surface of the cylindrical bushing B which is in contact with the loop-shaped restraining member 3 made of a fiber cord that transmits torque, thereby making it easier to operate. During torque transmission during use, the wear caused by direct rubbing of the fiber cord constituting the restraining member 3 against the outer surface of the cylindrical bushing B is significantly reduced, compared to the case where the conventional cylindrical bushing has a rough outer surface of a forged skin. However, a remarkable improvement in its durability was observed.

[Brief explanation of the drawing]

Fig. 1 shows a conventional example, a plan view in a half-sectional state, Fig. 2 is a sectional view taken along the line X-X in Fig. 1, and Fig. 3 shows the conventional example when the flexible coupling disk is in use. FIG. 4, which is a diagram for explaining the state of the restraining member, is a sectional view of a cylindrical bushing with flanges at both ends, which constitutes the present invention. 1...Rubber disk, 2...Cylindrical bushing with flanges on both ends, 3...Restriction member, 10...
...Flange part, a, b...Outer surface,
B...Cylindrical bushing with flanges on both ends.

Claims (1)

[Scope of utility model registration request] A plurality of cylindrical bushes with flanges on both ends are planted symmetrically in the center of a rubber disk with a hollowed out center, and fiber cords of rayon, polyester, etc. are bundled in a square cross-section between the cylindrical bushes to form a loop. The formed restraining members are alternately stretched over the cylindrical bushings so as to restrain each pair of adjacent cylindrical bushings, and are stretched under a constant tension. An improved flexible coupling disc embedded in a disc, characterized in that the outer surface of the cylindrical bushing with which the restraining members of the cylindrical bushings with flanges at both ends comes into contact has a mirror finish. .